Cross Sectional Imaging Lecture 2: Scanner Operation and Parameter Selection

These flashcards cover key concepts related to the operation and parameter selection in cross-sectional imaging, focusing on CT scans.

What is the main objective of protocol selection in CT imaging?

To answer the clinical question while optimizing image quality and minimizing radiation dose.

What are the key parameters that affect radiation dose and image quality in CT imaging?

kV, mAs, pitch, slice thickness, and image reconstruction algorithms.

What does kV stand for and what is its effect in CT imaging?

Kilovoltage; higher kV increases photon penetration and improves spatial resolution, but also increases radiation dose.

What is the relation between mAs and image quality in a CT scan?

Higher mAs increases the number of photons and enhances image quality, but also raises radiation dose.

What influences the protocol design for a CT scan?

Body area being scanned, field of view, and specific clinical question that needs to be addressed.

What is pitch in CT and how does it affect scanning?

Pitch is the distance the table travels per rotation divided by slice thickness; higher pitch reduces radiation dose but may affect image quality.

Define longitudinal resolution in CT imaging.

The ability to produce accurate imaging along the z-axis, representing slice thickness; thinner slices provide better detail.

Why is temporal resolution important in cardiac CT applications?

It allows the imaging of fast-moving objects, such as the beating heart, at different phases of the cardiac cycle.

What is the purpose of using contrast agents in CT imaging?

To enhance the resolution at low contrast, allowing differentiation between closely spaced tissues.

What are kernels in the context of CT imaging?

Algorithms applied to images to enhance specific features, such as spatial resolution or soft tissue detail.